We'd like to organise a challenge which goes this way- This will be a discussion thread for a copter will has a 30 minute endurance, i will take the suggestions, will build the copter as per advice and once the copter is ready to fly, i will liquidate the prices(or sooner)

this competition is strictly for adding valuable lessons to forum for those who aspire of making a pro-copter. prizes are only for encouraging participation and sharing knowledge base.

Top 5 contributors will get following freebies:
leading prize is an rtf toy copter and rest of the prizes will be rc stuff worth INR500
I may upgrade the prizes based on level of participation and quality of suggestions.

You are free to point out flaw in anyones setup and will give you a competitive advantage
Best of luck for a community driven product

problem statement- a y-6 sky hero frame, and an x-8 700mm sky-hero frame
you can use these 2 frames to predict best combination of motors escs

lets assume a pixhawk controller
motors-off power consumption is about 12 watts.  On a 4S battery, that's about 800mah.  That includes:
- Flight Controller (Pixhawk with single GPS/Compass and all usual attachments)
- Communications (Telemetry radio and UHF RC Receiver)
- Video System (Video transmitter, gimbal, and camera power)
- Lighting (LED position and strobe lights)

you can use 4s or 6s of any capacity for combinations.